(Once again, the number of bits, the number of
significant digits, and the range for each type was gleaned from
http://www.cplusplus.com/doc/tutorial/tut1-2.html. Hopefully the
character used above indicating plus or minus will survive the HTML
publishing process.)

These three types differ primarily in terms of the range of
values that they can support and the amount of memory required to store an
instance of the type.

Values of any of the three types can be either positive or
negative as indicated by the ± character.